The EMA8H3700P200F30D from ECHO Microwave is a Band Pass Filter with Frequency 3.6 to 3.8 GHz, Insertion Loss 3 dB, Rejection 30 to 50 dB, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8H3700P200F30D can be seen below.